It was noticed some years ago that a large number of light gold
coins were in circulation, and the discovery was made that the
“sweating” was accomplished by electrolysis. The scientific
swindler constructed an electro-deposition plant, using a
ten-dollar gold piece as an anode and a small metal plate as a
cathode. The battery was “set in motion” and presto! in a few
minutes fifty cents’ worth of gold was deposited on the metal
plate, and the gold coin was worth so much less than before. As
the gold was removed equally from all parts of the surface of
the coin, its appearance was scarcely altered by the process,
only an expert being able to detect the slight blurring of the
design and lettering.--_Electrical Review._
(1147)